CVE-2026-87886

CRITICALPre-NVD 7.89.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2026-09-16), indicating real-world exploitation has been confirmed by US federal agencies. a secondary CVSS source baseline 7.8 retained for reference (NVD's own analysis pending). Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, ghsa, secondary
Trending — KEV-added this weekExploited in the wild
9.0EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 0%CVSS: 7.8Exploit: cisa kev · ssvc activeExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Local privilege escalation due to insecure file permissions. The following products are affected: Acronis Backup plugin for cPanel & WHM (Linux) before build 1.9.3.1021, Acronis Backup extension for Plesk (Linux) before build 1.8.11.638, Acronis Backup plugin for DirectAdmin (Linux) before build 1.2.3.238.

CVSS v3
7.8
EG Score
9.0(high)
EG Risk
81(Attend)
EG Risk 81/100SSVC: Attend

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity90% × 45%
Exploitation100% × 40%
Automatability0% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
0%
EPSS %ILE
17%
KEV
⚠ Exploited

Published

September 17, 2026

Last Modified

September 18, 2026

Advisory Details (1)

Auto-updated Sep 17, 2026
No patch confirmed yet.
generic

Acronis Advisory Database - Acronis

https://security-advisory.acronis.com/advisories/SEC-10986

Vendor Advisories for CVE-2026-87886(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 32× in last 7d / 32× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-20 12:47 UTCGHSA enrichment
  2. 2026-09-20 08:40 UTCGHSA enrichment
  3. 2026-09-20 04:32 UTCGHSA enrichment
  4. 2026-09-20 00:25 UTCGHSA enrichment
  5. 2026-09-19 20:17 UTCGHSA enrichment
  6. 2026-09-19 16:09 UTCEG score recompute
  7. 2026-09-19 16:09 UTCGHSA enrichment
  8. 2026-09-19 12:01 UTCGHSA enrichment
  9. 2026-09-19 07:53 UTCGHSA enrichment
  10. 2026-09-19 03:45 UTCGHSA enrichment
  11. 2026-09-18 23:38 UTCGHSA enrichment
  12. 2026-09-18 19:31 UTCEG score recompute
  13. 2026-09-18 19:31 UTCGHSA enrichment
  14. 2026-09-18 19:28 UTCEPSS rescore
  15. 2026-09-18 19:20 UTCCISA KEV update
  16. 2026-09-18 15:23 UTCEG score recompute
  17. 2026-09-18 15:23 UTCGHSA enrichment
  18. 2026-09-18 14:44 UTCEG score recompute
  19. 2026-09-18 14:44 UTCGHSA enrichment
  20. 2026-09-18 14:15 UTCEG score recompute▲ 1.20
  21. 2026-09-18 14:15 UTCGHSA enrichment
  22. 2026-09-18 14:15 UTCCISA KEV update
  23. 2026-09-18 13:22 UTCEG score recompute
  24. 2026-09-18 13:22 UTCGHSA enrichment
  25. 2026-09-18 13:18 UTCEG score recompute
Show 7 more
  1. 2026-09-18 13:18 UTCGHSA enrichment
  2. 2026-09-18 12:37 UTCGHSA enrichment
  3. 2026-09-18 11:46 UTCEG score recompute
  4. 2026-09-18 11:46 UTCGHSA enrichment
  5. 2026-09-17 23:25 UTCEG score recompute
  6. 2026-09-17 23:05 UTCEG score recompute
  7. 2026-09-17 23:04 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(6)

What is CVE-2026-87886?
CVE-2026-87886 is a critical vulnerability published on September 17, 2026. Local privilege escalation due to insecure file permissions. The following products are affected: Acronis Backup plugin for cPanel & WHM (Linux) before build 1.9.3.1021, Acronis Backup extension for Plesk (Linux) before build 1.8.11.638, Acronis Backup plugin for DirectAdmin (Linux) before build…
When was CVE-2026-87886 disclosed?
CVE-2026-87886 was first published in the National Vulnerability Database on September 17, 2026, with the most recent update on September 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-87886 actively exploited?
Yes. CISA added CVE-2026-87886 to the Known Exploited Vulnerabilities catalog on September 16, 2026, affecting Acronis Backup. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2026-87886?
CVE-2026-87886 has a CVSS v3 base score of 7.8 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
Which products are affected by CVE-2026-87886?
CVE-2026-87886 affects Acronis Backup. The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.
How do I remediate CVE-2026-87886?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-87886, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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